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File: The Oakland Athletics played the Seattle Mariners at O.co Coliseum in Oakland, Calif., on Sunday, June 16, 2013. Oakland defeated Seattle 10-2. (Jose Carlos Fajardo/Bay Area News Group)

OAKLAND -- An "unidentifiable mass" in a sewer line was to blame for a flood of sewage in the A's clubhouse, the umpires' dressing room and the visiting team's clubhouse on Sunday, officials said Wednesday.

"All the work is being done and we fully expect everything to be in order for the game next Tuesday," said Dave Rinetti, the A's vice president of stadium operations. "They found some kind of unidentifiable mass in the system that they cleared."

The A's play a home game against the Cincinnati Reds at 7 p.m. Tuesday.

Rinetti said the sewage and water that oozed into the showers of the three locker rooms and overflowed onto hallway carpets was an inconvenience for both teams and the umpires.

The A's and Seattle Mariners had to leave their clubhouses and shower in the Raiders' locker room, which is located one level above the baseball clubhouses, after the game. The baseball clubhouses are on the lowest level of the stadium.

A's equipment manager Steve Vucinich said on Sunday that he'd never seen such an extreme sewage event in his 46 years working at the stadium, which opened in 1968.

A's spokesman Bob Rose added that "there have been all kinds" of lesser plumbing problems documented in the past. He said the carpets in the clubhouses are being replaced while the A's are on a seven-game road trip, which started Monday in Texas.

"Bottom line is it happened, we addressed it, it's an old facility and we're doing the best we can," Rose said. "It's just too bad it happened."

Officials with Anschutz Entertainment Group, the company that manages the facility for the Joint Powers Authority formed by the city of Oakland and Alameda County, did not return phone calls Wednesday on the sewage problem.

Contact Doug Oakley at 510-843-1408. Follow him at Twitter.com/douglasoakley.